“Doctor Who,” TV’s longest running science fiction series, celebrates a landmark this year — its 50th anniversary. As for the Doctor himself, played currently by Matt Smith, he clocks in at upward of 1,200 years old (as stated in the recent Western-themed episode “A Town Called Mercy”). Eleven Doctors have graced the series, thanks to the crafty introduction of regeneration, which allows the Doctor, upon death, to transform into a new body.

“Doctor Who,” TV’s longest running science fiction series, celebrates a landmark this year — its 50th anniversary. As for the Doctor himself, played currently by Matt Smith, he clocks in at upward of ... more